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A great deal of effort has been expended and many accomplishments realized over the past 25 years in ASTM in the area of low temperature engine oil rheology. One major topic of research and development has been that of low temperature engine oil pumpability. This area has gained at least equal prominence and importance to low temperature (SAE “W” grade) engine oil requirements in SAE J 300, as engine cranking. In addition, a worldwide roundrobin on the Cold Cranking Simulator (CCS) at multiple use temperature was recently completed. This round robin provided a useful precision statement for the Multi-temperature CCS Method in SAE J 300 for establishing meaningful cranking limits for “W” graded oils. This paper will trace the history of these pertinent developments and their timely importance to the automotive industry.
historical perspective, test methods, oil rheology
Senior research associate, Exxon Research and Engineering, Annandale, NJ